JPH01115592A - Sheet material cutter - Google Patents

Abstract

PURPOSE: To very easily carry out the connection and separation of a connecting member to a gear and to make free the rotational direction of the gear by providing the gear being rotatingly driven by a motor with an engaging member which is elastically deformed to be freely engaged to or detached from the opening of the connecting member. CONSTITUTION: A claw 6b is forcedly pressed in the direction of an arrow H so as to be elastically deformed, and a connecting rod 5 is pressedly pushed in the direction of an arrow I so that the claw 6b is inserted into the hole 5a for fitting a boss 6a. In this state, by releasing the claw 6b, the claw 6b returns to the original shape and engages with the outer side surface of the connecting rod 5 in the circumference of the hole 5a. Thus, the coming-out of the connecting rod 5 from the boss 6a of the gear is prevented, and the connecting rod 5 is connected to a large gear wheel. In this state, a moving edge is oscillated to a fixed edge by the driving force of a motor through a pinion, intermediate gear, large gear wheel, connecting rod 5, and a lever for cutting the recording sheet. To release this connection, the claw 6b is pressedly pushed in the direction of the arrow H to disconnect the engagement with the connecting rod 5, and the connecting rod 5 is drawn in the direction of the arrow I' for disconnecting the connection therewith.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a sheet material cutting device such as a recording paper cutting device provided in various recording devices, for example.

[Prior Art] A recording paper cutting device provided in various conventional recording devices includes a gear rotationally driven by a motor as a drive source;
A structure is adopted in which the cutting blade for recording paper is swung through a link mechanism constituted by a connecting rod that is swingably connected to this gear to perform cutting. In this structure, the gear and the connecting rod are connected by fitting the boss protruding from the side surface of the gear into a hole formed in the connecting rod so as to be able to swing. In the past, in order to prevent the connecting rod from falling out or coming off from the gear boss, a screw or ring was fixed to the boss with a gap between it and the connecting rod. .

[Problems to be Solved by the Invention] However, the conventional structure as described above has the following drawbacks.

(a) When the connecting rod is prevented from being removed by screwing it to the boss, the rotation direction of the gear is limited so that the boss rotates in the direction of rotation in which the screw is tightened, and the design has to be adjusted accordingly. Freedom is limited.

(b) If the boss of the gear mentioned above is located deep inside the recording device in which the recording paper cutting device is installed, the connecting rod cannot be removed during assembly during the manufacturing process or disassembly for maintenance. It may be difficult to insert a screwdriver to fasten or remove screws, or it may be difficult to remove rings, making it difficult to connect or separate gears and connecting rods.

If space is taken up within the device to facilitate this work, the recording device will become larger.

(C) The number of parts increases by the number of screws or rings.

[Means for Solving the Problems] In order to solve such problems, according to the present invention, in a sheet material cutting device for cutting a sheet material, a cutting blade for cutting the sheet material; a support means for movably supporting the cutting blade; a driving force receiver receiving a driving force for displacing the cutting blade supported by the supporting means; a motor; and a motor, which is rotated by the driving force of the motor. a connecting member having an opening for transmitting the rotational force of the gear to the driving force receiver; and a connecting member provided on the gear that is elastically deformable and can be engaged with and detached from the opening of the connecting member. A structure having an engaging member for engagement is adopted.

[Function] According to this structure, by elastically deforming the engaging member, the connecting member can be connected to or separated from the gear with a single touch. Also,
The direction of rotation of the gear is not limited as is the case when screws are used to prevent removal.

[Embodiments] Hereinafter, details of embodiments of the present invention will be described with reference to the attached drawings.

FIG. 1 shows the overall structure of a recording paper cutting device incorporated into a recording apparatus as an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes a support frame that supports a blade that cuts the recording paper 10 of a recording paper cutting device, and a fixed blade 3 and a movable blade 2 are arranged in parallel and opposite each other on this support frame 1. .

The fixed blade 3 is supported and fixed by a shaft 3a. Further, the movable blade 2 is supported by a shaft 2a, and is provided so as to be able to swing in the direction of the arrow with the glaze 2a as the center of swing. A drive shaft 2b for swinging the movable blade 2 is coupled to the free end side of the movable blade 2.

A lever 4 bent in a substantially dogleg shape is fixed to the right end of the shafts 2a and 2b in the figure, and can swing in directions of arrows G and G' with the shaft 2a as the center of swing. It is provided. A connecting pin 4a is implanted on the outer surface of the free end of the lever 4, and a connecting rod 5, which is shown enlarged in FIG. 2, fits into a hole 5b formed at the left end in the figure. By doing so, the lever 4 and the connecting rod 5 are coupled to each other so as to be able to swing relative to each other.

Further, the right end side of the connecting rod 5 in FIG. 1 is swingably connected to a large gear 6. The large gear 6 is integrally molded from a molding material such as a resin having appropriate elasticity such as polyacetal. In order to connect it to the connecting rod 5, a boss portion is provided on the outer surface of the large gear 6, which is pivotally fitted into a circular hole 5a formed at the right end of the connecting rod 5 in FIG.
A boss 6a and a pawl 6b are integrally formed on the large gear 6 and are provided in a protruding manner.

As shown in FIG. 2, the boss 6a has a partially cut-out cylindrical shape, that is, a substantially C-shaped tube. Further, the claw 6b is provided in a protruding manner within the notch of the boss 6a, and the outer surface of its base coincides with the extension of the outer circumferential surface of the boss 6a. Further, the tip of the claw 6b projects outward from the outer peripheral surface of the boss ja. As mentioned above, since the entire large gear 6 is made of a molded material with appropriate elasticity and the pawl 6b is separated from the boss 6a, the pawl 6b moves in the direction H in FIG. 2, that is, toward the inside of the boss part. If you push it in one direction, it will easily elastically deform in the same direction.

In such a structure of the boss part, in the state shown in FIG. 2, the claw 6b is pressed in the direction of the arrow H to elastically deform it, and the connecting rod 5 is pushed in the direction of the arrow to insert the claw 6b into the hole 5a. By fitting the boss 6a and then releasing the claw 6b, the claw 6b returns to its original shape and engages with the outer surface of the connecting rod 5 at the periphery of the hole 5a. As a result, the connecting rod 5 is prevented from being removed from the boss portion of the gear 6, and the connecting rod 5 is coupled to the large gear 6. Note that since the pressing of the pawl 6b in the H direction can be performed by the connecting rod 5 itself, the connecting rod 5 can be coupled to the large gear 6 simply by pushing the hole 5a of the connecting rod 5 into the boss 6a and the pawl 6b.

Furthermore, from this connected state, the connecting rod 5 can be removed from the large gear 6 by pressing the pawl 6b in the direction of the arrow H to disengage it from the connecting rod 5, and pulling the connecting rod 5 in the working direction. .

With such a structure, the connecting rod 5 and the large gear 6 are connected, and a link mechanism for swinging the lever 4 is formed between the two and the lever 4.

Further, the large gear 6 is a small gear 7a of the intermediate gear 7 of two stages, large and small.
The large gear 7b of the intermediate gear 7 meshes with the small gear 8 fixed to the tip of the output rotating shaft 9a of the output shaft 9, which is the drive source of the recording paper cutting device.

When the recording paper cutting device is driven with the above structure, the small gear 8 is rotationally driven by the motor 9 in the direction of the arrow E, and the large gear 6 is rotated in the direction of the arrow F via the intermediate gear 7. , the lever 4 is swung in the direction of the arrow G%G' through a link mechanism consisting of the large gear 6, the connecting rod 5, and the lever 4, and the movable blade 2 is swung in the direction of the arrow and the fixed blade 3.
The recording paper 10 is cut by working together with the recording paper 10.

By the way, when such a recording paper cutting device is driven, the link mechanism consisting of the lever 44, the connecting rod 5, and the large gear 6 operates as shown in FIGS. 3(A) to 3(D). A reaction force against the driving force of the movable blade 2 is applied from the connecting rod 5 to the boss portion consisting of the boss 6a and the claw 6b in the following manner.

First, FIG. 3(A) shows a standby state.

The movable blade 2 is in a standby state separated from the fixed blade 3. From this state, the large gear is rotated in the F direction by the drive of the motor 9 mentioned above, the lever 4 is swung in the G direction, the movable blade 2 is swung in the slant direction, and cutting of the recording paper 10 is started. A reaction force due to the resistance force of the recording paper 10 is applied to the boss portion of the large gear 6 by the connecting rod 5 via the movable blade 2 and the lever 4. At the cutting start position shown in FIG. 3(A), the above-mentioned reaction force causes the axis of the connecting rod 5 that connects the center of the connecting pin 4a of the lever 4 and the center of the boss portion consisting of the boss 6a and the claw 6b to butt against the boss portion. Join part A.

When the large gear 6 further rotates in the F direction, the lever 4
swings in the G direction, the movable blade 2 swings further in the direction,
It swings as shown in FIG. 3(A), FIG. 3(B), and then FIG. 3(C). FIG. 3(B) shows a state in the middle of cutting, and in this state, the above-mentioned reaction force is applied to a portion B of the boss portion clockwise shifted from a portion A as the large gear 6 rotates. Further, FIG. 3(C) shows a state in which cutting of the recording paper 10 has been completed, and in this state, a reaction force is applied to a portion C further shifted clockwise from the portion B.

Then, by further rotating the large gear 6 in the F direction from the state shown in FIG. 3(C), the lever 4 and the movable blade 2 are each rotated at G in the opposite direction to the above, as shown in FIG. 3(D). 3 (A).
In the states from (C) to (C), the boss pushed the connecting rod 5 to the left in the figure, but in the states from (C) to (D) in Figures 3, it was pulled to the right in the figure. , the reaction force from the connecting rod 5 described above is applied to the opposite right side of the boss portion in the figure. That is, the point where the reaction force is applied jumps from part C to part A on the opposite side, and then moves counterclockwise from part A back to part C. In the state shown in FIG. 3(D), it joins the B° portion which is slightly back toward the C portion from the B portion.

The large gear 6 further rotates in the F direction from the state shown in FIG. 3(D), thereby returning to the standby state shown in FIG. 3(A) as indicated by the two-dot chain line in the same drawing.

As described above, when the recording paper cutting device operates, the reaction force applied from the connecting rod 5 to the boss portion is applied within the region from portion A to portion C through portion B at the boss portion.

Here, when the above-mentioned reaction force is applied to the claw 6b at the boss portion, the strength of the claw 6b is made weak so that it can easily be elastically deformed as described above. There is a risk of plastic deformation or breakage. Furthermore, when the connecting rod 5 is swung with a reaction force applied to the claw 6b, that is, with the inner wall surface of the hole 5a of the connecting rod 5 in contact with the claw 6b, a boss is formed in the region of the claw 6b. Due to the difference in level between the notch 6a and the notch, there is a play in the rocking, and the rocking cannot be performed smoothly.

Therefore, in this embodiment, as shown in FIGS. 3(A) to 3(D), the claw 6b is not located in the area from part A through part B to part C in the boss part, that is, the area where the reaction force is applied. It is provided in a region on the opposite side to which no reaction force is applied, for example, at portion D shown in FIG. 3(D). This prevents plastic deformation and breakage of the pawl 6b, and ensures smooth rocking of the connecting rod 5 and the boss portion.

It should be noted that the reaction force applied to the boss portion in each state shown in FIGS. 3A to 3D is large while the recording paper 10 is being cut, but is very small during idle rotation. Therefore, the position where the claw 6b is provided in the boss portion may be at least an area that does not receive reaction force while cutting the recording paper 10, and not only an area that does not receive reaction force at all times, but also an area that receives reaction force during idling. It may be provided in the area.

In addition, by increasing the distance between the center of the large gear 6 and the center of the boss portion, or by decreasing the distance between the shaft 2a, which is the center of swing of the lever 4, and the connecting pin 48, the swing of the lever 4 with respect to the rotation angle of the large gear 6 is reduced. By increasing the ratio of the amount of movement (the amount of oscillation of the movable blade 2), the rotation angle of the large gear 6 relative to the amount of oscillation of the movable blade 2 required to cut the recording paper can be reduced, and the reaction force at the boss portion is reduced while cutting the recording paper. The range and angle of the added area can be reduced.

According to this embodiment as described above, by elastically deforming the pawl 6b of the large gear as described above, the connecting rod 5 can be connected to or separated from the large gear 6 very easily with one touch. Therefore, the space for connecting or separating the connecting rod 5 to the large gear 6 in the recording apparatus in which the recording paper cutting device is incorporated can be reduced, and the recording apparatus can be made smaller.

Further, according to this embodiment, since the large gear 6 of the connecting rod 5 is prevented from being removed by the pawl 6b, the large gear 6 is prevented from being removed by tightening the screw in the direction in which the screw is tightened. The rotation direction is not limited, and the degree of freedom in design can be increased accordingly.

Furthermore, according to this embodiment, the boss portion consisting of the boss 6a and the pawl 6b is integrally molded with the large gear 6, thereby reducing the number of parts and reducing costs.

Furthermore, according to this embodiment, by arranging the pawl 6b in the boss portion in an area where no reaction force is applied during cutting of the recording paper as described above, deformation or breakage of the pawl 6b is prevented, and the connection Smooth rocking between the rod 5 and the boss portion is ensured, and the durability and reliability of the recording paper cutting device can be improved.

[Effects of the Invention] As is clear from the above description, according to the present invention, in a sheet material cutting device for cutting a sheet material, a cutting blade for cutting the sheet material and the cutting blade can be displaced. a support means for supporting the cutting blade; a drive force receiver receiving a drive force for displacing the cutting blade supported by the support means; a motor; a gear rotated by the drive force of the motor; and the gear. a connecting member having an opening for transmitting the rotational force of the driving force receiver to the driving force receiver; and a coupling member provided on the gear that is elastically deformed and removably engaged with the opening of the connecting member. Since we adopted a structure with a connecting member, it is extremely easy to connect or separate the connecting member to the gear, which makes it possible to reduce the size of the device that incorporates the sheet material cutting device, and to reduce the design in terms of the rotation direction of the gear. Excellent effects such as increased flexibility can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the overall structure of a recording paper cutting device according to an embodiment of the present invention, FIG. 2 is a perspective view showing the structure of the connecting rod and the boss of the large gear in FIG. 1, and FIG. (A) to (D) are explanatory diagrams of the operation of the link mechanism composed of the lever 4, the connecting rod 5, and the large gear 6 in FIG. 1, and the reaction force applied to the boss portion of the large gear during the operation. 1...Support frame 2...Movable blade 3...Fixed blade 4...Lever 5...Connecting rod
6...Large gear 6a...Boss 6b...Claw 7...Intermediate gear 8...Small gear 9...Motor 10...Recording paper 5q;r;Person Figure 2 Fog 2 = Kusunoki (11-I--ku m ~(

Claims (1)

[Claims] 1) A sheet material cutting device for cutting a sheet material, comprising: a cutting blade for cutting the sheet material; a support means for movably supporting the cutting blade; and the support means. a driving force receiver for receiving a driving force for displacing a cutting blade supported by the motor; a gear for rotating by the driving force of the motor; and for transmitting the rotational force of the gear to the driving force receiver. A method for cutting a sheet material, comprising: a connecting member having an opening; and an engaging member provided on the gear for elastically deforming and removably engaging with the opening of the connecting member. Device. 2) The engaging member is provided in an area where the reaction force of the driving force of the cutting blade for cutting the sheet material is not easily received from the connecting member during cutting of the sheet material when the sheet material cutting device is driven. A sheet material cutting device according to claim 1.